Invention Grant
- Patent Title: Thermal-assist magnetic recording medium and magnetic recording and reproducing apparatus
- Patent Title (中): 热辅助磁记录介质和磁记录和再现装置
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Application No.: US12627719Application Date: 2009-11-30
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Publication No.: US08705207B2Publication Date: 2014-04-22
- Inventor: Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
- Applicant: Tetsuya Kanbe , Yuzo Sasaki , Atsushi Hashimoto
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2008-306653 20081201
- Main IPC: G11B5/82
- IPC: G11B5/82

Abstract:
A thermal-assist magnetic recording medium is provided which can accomplish a surface recording density of 1 Tbit/inch2. The thermal-assist magnetic recording medium includes: a substrate; a plurality of underlying layers formed on the substrate; a first magnetic layer formed on the underlying layers; a coupling control layer formed on the first magnetic layer and formed of a ferromagnetic alloy; and a second magnetic layer formed on the coupling control layer. Here, Curie temperatures of the first magnetic layer and the second magnetic layer are higher than the Curie temperature of the coupling control layer, an anisotropy magnetic field of the first magnetic layer is greater than the anisotropy magnetic field of the second magnetic layer, and a saturation magnetic field has a minimum value at a temperature of 350° C. or lower.
Public/Granted literature
- US20100182714A1 THERMAL-ASSIST MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS Public/Granted day:2010-07-22
Information query
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